<template>
	<view v-if="goods_info.goods_name" class="goods-detail">
		<!-- 轮播图区域 -->
		<swiper
			:indicator-dots="true"
			:autoplay="true"
			:interval="3000"
			:duration="1000"
			:circular="true"
		>
			<swiper-item v-for="(item, index) in goods_info.pics" :key="index">
				<image :src="item.pics_big" @click="preview(index)"></image>
			</swiper-item>
		</swiper>
		<!-- 商品信息区域 -->
		<view class="goods-info-box">
			<!-- 商品价格 -->
			<view class="price">￥{{ goods_info.goods_price }}</view>
			<!-- 信息主体区域 -->
			<view class="goods-info-body">
				<!-- 商品名称 -->
				<view class="goods-name">{{ goods_info.goods_name }}</view>
				<!-- 收藏 -->
				<view class="favi">
					<uni-icons type="star" size="18" color="gray"></uni-icons>
					<text>收藏</text>
				</view>
			</view>
			<!-- 运费 -->
			<view class="yf">快递：免运费</view>
		</view>
		<!-- 商品详情信息 -->
		<rich-text :nodes="goods_info.goods_introduce"></rich-text>
		<!-- 底部商品导航 -->
		<view class="goods-carts">
			<uni-goods-nav
				:fill="true"
				:options="options"
				:buttonGroup="buttonGroup"
				@click="onClick"
				@buttonClick="buttonClick"
			/>
		</view>
	</view>
</template>

<script>
import { mapState, mapMutations, mapGetters } from 'vuex';
export default {
	data() {
		return {
			goods_info: {},
			options: [
				{
					icon: 'shop',
					text: '店铺'
				},
				{
					icon: 'cart',
					text: '购物车',
					info: 0
				}
			],
			buttonGroup: [
				{
					text: '加入购物车',
					backgroundColor: '#ff0000',
					color: '#fff'
				},
				{
					text: '立即购买',
					backgroundColor: '#ffa200',
					color: '#fff'
				}
			]
		};
	},
	computed: {
		...mapGetters('m_cart', ['total'])
	},
	watch: {
		total: {
			// handler 属性用来定义侦听器的 function 处理函数
			handler(newVal) {
				const findResult = this.options.find(item => item.text === '购物车');
				if (findResult) {
					findResult.info = newVal;
				}
			},
			// immediate 属性用来声明此侦听器，是否在页面初次加载完毕后立即调用
			immediate: true
		}
	},
	onLoad(options) {
		const goods_id = options.goods_id;
		this.getGoodsDetail(goods_id);
	},
	methods: {
		// 获取商品详情
		async getGoodsDetail(goods_id) {
			const { data: res } = await uni.$http.get('/api/public/v1/goods/detail', { goods_id });
			if (res.meta.status !== 200) return uni.$showMsg();
			res.message.goods_introduce = res.message.goods_introduce
				.replace(/<img /g, '<img style="display:block;" ')
				.replace(/webp/g, 'jpg');
			this.goods_info = res.message;
		},
		// 实现轮播图的预览效果
		preview(i) {
			// 调用 uni.previewImage() 方法预览图片
			uni.previewImage({
				// 预览时，默认显示图片的索引
				current: i,
				// 所有图片 url 地址的数组
				urls: this.goods_info.pics.map(x => x.pics_big)
			});
		},

		onClick(e) {
			if (e.content.text === '购物车') {
				// 切换到购物车页面
				uni.switchTab({
					url: '/pages/cart/cart'
				});
			}
		},
		buttonClick(e) {
			// 1. 判断是否点击了 加入购物车 按钮
			if (e.content.text === '加入购物车') {
				// 2. 组织一个商品的信息对象
				const goods = {
					goods_id: this.goods_info.goods_id, // 商品的Id
					goods_name: this.goods_info.goods_name, // 商品的名称
					goods_price: this.goods_info.goods_price, // 商品的价格
					goods_count: 1, // 商品的数量
					goods_small_logo: this.goods_info.goods_small_logo, // 商品的图片
					goods_state: true // 商品的勾选状态
				};

				// 3. 通过 this 调用映射过来的 addToCart 方法，把商品信息对象存储到购物车中
				this.addToCart(goods);
			}
		},
		...mapMutations('m_cart', ['addToCart'])
	}
};
</script>

<style lang="scss">
.goods-detail {
	padding-bottom: 50px;
	swiper {
		height: 750rpx;

		image {
			width: 100%;
			height: 100%;
		}
	}
	// 商品信息区域的样式
	.goods-info-box {
		padding: 10px;
		padding-right: 0;

		.price {
			color: #c00000;
			font-size: 18px;
			margin: 10px 0;
		}

		.goods-info-body {
			display: flex;
			justify-content: space-between;

			.goods-name {
				font-size: 13px;
				padding-right: 10px;
			}
			// 收藏区域
			.favi {
				width: 120px;
				font-size: 12px;
				display: flex;
				flex-direction: column;
				justify-content: center;
				align-items: center;
				border-left: 1px solid #efefef;
				color: gray;
			}
		}

		// 运费
		.yf {
			margin: 10px 0;
			font-size: 12px;
			color: gray;
		}
	}
	.goods-carts {
		position: fixed;
		bottom: 0%;
		left: 0;
		width: 100%;
	}
}
</style>
